build: convert repo from npm to pnpm

[DylanPiercey]

• pnpm import package-lock.json → pnpm-lock.yaml; remove package-lock.json; add packageManager: pnpm@11.15.1
• pnpm-workspace.yaml allowBuilds for tree-sitter, tree-sitter-cli, esbuild (pnpm blocks dependency install scripts by default; tree-sitter needs its native build, tree-sitter-cli downloads its binary)
• ci.yml + release.yml: pnpm/action-setup@v6 + cache: pnpm, pnpm install --frozen-lockfile (with --ignore-scripts kept for prebuild jobs), pnpm run; changesets action version/publish commands use pnpm. npm install -g npm@latest kept in the publish job — changeset publish still shells out to npm for OIDC trusted publishing
• version script: npm install --package-lock-only → pnpm install --lockfile-only
• README/tools contributor commands npm/npx → pnpm; ignore package-lock.json/yarn.lock

Verified locally (Node 22): pnpm install (native addon builds), pnpm run build, pnpm test (374 passing), pnpm run build:wasm + test:wasm (wasm OK), pnpm install --frozen-lockfile.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 2a71f29

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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📥 Commits

Reviewing files that changed from the base of the PR and between 7fb2038 and 2a71f29.

⛔ Files ignored due to path filters (2)

• package-lock.json is excluded by !**/package-lock.json and included by **
• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml and included by **

📒 Files selected for processing (8)

• .github/workflows/ci.yml
• .github/workflows/release.yml
• .gitignore
• README.md
• package.json
• pnpm-workspace.yaml
• tools/check.mts
• tools/run-corpus.mts

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• Create PR with unit tests
• Commit unit tests in branch dpiercey-ws-pnpm-0rjo9g

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